How to convert time assigned with a string "1/7/2004 1:14:00 PM" to UTC format (no of seconds since 1970)which looks like 1073738469947

I don't have an answer for you, but wanted to point out a terminology error.

# of seconds since 1970 is Unix timestamp, not UTC. UTC is a synonym for Greenwich Mean Time (GMT).

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There's no easy way to do this, you've all the arithmetic to do yourself. You'll have to parse the string for the various numbers, and then do the math, taking care of leap years and such.

A guy has tried this here: www.listserv.shafik.org but no guarantees.

Any good?
GF